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Windows 10 (ssd1) won't boot as default after installation Windows 11 (ssd2)

Chris1O8 0 Reputation points
2024-05-13T19:24:12.76+00:00

My laptop contained one m.2 SSD with an installation of Windows 10 Pro (disk 1). I installed a second m.2 SSD on which I installed Windows 11 Pro (disk 0). When I turn on the laptop I see the boot manager. Win11 starts by default. I would like to change that to default Win10. If I adjust the order (so that Win10 starts after x seconds by default), a black screen appears after the boot manager. Nothing else happens (not even after 10 minutes). I can still get into Win10 in the following situations:

Option 1:

  • set Win10 as default
  • start Win11 via boot manager
  • in Win11 I choose shutdown
  • turn on laptop
  • start Win10 via boot manager
  • Windows 10 starts up

Option 2:

  • set Win11 as default
  • start Win10 via boot manager

Both options are not ideal, because I want to boot Win10 by default (without having to choose anything). It looks like something is going wrong in the boot manager.

I would like to know what other options I can try. Thanks for the help!

Windows 10
Windows 10
A Microsoft operating system that runs on personal computers and tablets.
10,806 questions
Windows 11
Windows 11
A Microsoft operating system designed for productivity, creativity, and ease of use.
8,408 questions

2 answers

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  1. S.Sengupta 15,756 Reputation points MVP
    2024-05-14T01:29:03.7733333+00:00

    Boot into Windows 11 from the boot manager

    Open Command Prompt as Admin and backup the BCD.

    bcdedit /export C:\BCD_Backup

    Now rebuild BCD:

    bootrec /fixmbr

    bootrec /fixboot

    bootrec /scanos

    bootrec /rebuildbcd

    Open Windows 11 from the boot manager.

    Open Command Prompt as Admin and list boot entries:

    bcdedit /enum

    Look for the entry that corresponds to your Windows 10 installation. Note the identifier (usually in the form of {xxxx-xxxx-xxxx-xxxx}).

    Type the following command, replacing {identifier} with the actual identifier of the Windows 10 entry:

    bcdedit /default {identifier}

    bcdedit /timeout 5

    Restart your laptop to see if Windows 10 boots by default.

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  2. Hania Lian 8,551 Reputation points Microsoft Vendor
    2024-05-16T03:06:30.56+00:00

    Hello,

    Changing the boot priority in the BIOS/UEFI settings.

    1. Restart your computer and press the appropriate key (typically F12, DEL, ESC) to enter into your BIOS/UEFI settings. The key might vary depending on your laptop’s manufacturer—refer to your user manual if needed.
    2. Go to the ‘Boot’ option/tab.
    3. Change the boot priority so the SSD containing Windows 10 is at the top.
    4. Save the changes and exit. The computer will then restart.

    Best Regards,

    Hania Lian

    ============================================

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